(function ($) {
  'use strict';

  const config = window.aksrtWidgetAdmin || {};

  function initForm(root) {
    const $root = $(root);
    $root.find('.aksrt-widget-color').wpColorPicker();
    $root.find('.aksrt-widget-repeater__rows').sortable({
      handle: '.dashicons-move',
      axis: 'y',
      update: renumberRepeaters,
    });
    $root.find('input[type="range"]').each(function () {
      const output = this.parentElement.querySelector('output');
      if (output) this.addEventListener('input', () => { output.textContent = this.value; });
    });
    evaluateDependencies($root);
  }

  function loadForm(container) {
    const $container = $(container);
    if ($container.data('loading') || $container.data('loaded')) return;
    $container.data('loading', true).find('.aksrt-widget-form-lazy__status').text(config.i18n?.loading || 'Loading…');
    $.post(config.ajaxUrl, {
      action: config.action,
      nonce: config.nonce,
      id_base: $container.data('id-base'),
      widget_number: $container.data('widget-number'),
    }).done((response) => {
      if (!response?.success || !response.data?.html) throw new Error('Invalid response');
      const $form = $(response.data.html);
      $container.replaceWith($form);
      initForm($form);
    }).fail(() => {
      $container.data('loading', false).find('.aksrt-widget-form-lazy__status').text(config.i18n?.error || 'Failed to load.');
    });
  }

  function renumberRepeaters(_event, ui) {
    const $form = $(ui?.item || this).closest('.aksrt-widget-form');
    $form.find('.aksrt-widget-repeater__rows').each(function () {
      $(this).children('.aksrt-widget-repeater__row').each(function (index) {
        this.dataset.rowIndex = String(index);
      });
    });
    $form.find('[name]').each(function () {
      const rowIndexes = $(this).parents('.aksrt-widget-repeater__row').get().reverse().map((row) => Number(row.dataset.rowIndex || 0));
      if (!rowIndexes.length) return;
      let foundWidgetNumber = false;
      let cursor = 0;
      this.name = this.name.replace(/\[(\d+|__index_[a-f0-9]+__)\]/g, (match, index) => {
        if (!foundWidgetNumber && /^\d+$/.test(index)) {
          foundWidgetNumber = true;
          return match;
        }
        return cursor < rowIndexes.length ? `[${rowIndexes[cursor++]}]` : match;
      });
    });
  }

  function fieldValue($form, id) {
    const $field = $form.find(`.aksrt-widget-field[data-field-id="${CSS.escape(id)}"]`).first();
    const $checked = $field.find('input:checked').first();
    if ($checked.length) return String($checked.val());
    return String($field.find('input,select,textarea').first().val() ?? '');
  }

  function evaluateDependencies($form) {
    $form.find('[data-dependency]').each(function () {
      let rule;
      try { rule = JSON.parse(this.dataset.dependency || '[]'); } catch (_error) { return; }
      if (!Array.isArray(rule) || rule.length < 3) return;
      const $row = $(this).closest('.aksrt-widget-repeater__row');
      const current = fieldValue($row.length ? $row : $form, String(rule[0]));
      const expected = String(rule[2]);
      const visible = rule[1] === '==' ? current === expected : current !== expected;
      this.hidden = !visible;
    });
  }

  $(document)
    .on('click', '.aksrt-widget-form-lazy__load', function () { loadForm($(this).closest('.aksrt-widget-form-lazy')); })
    .on('click', '.widget.open .aksrt-widget-form-lazy', function () { loadForm(this); })
    .on('change input', '.aksrt-widget-form input, .aksrt-widget-form select, .aksrt-widget-form textarea', function () { evaluateDependencies($(this).closest('.aksrt-widget-form')); })
    .on('click', '.aksrt-widget-repeater__add', function () {
      const $repeater = $(this).closest('.aksrt-widget-repeater');
      const max = Number($repeater.data('max-items') || 50);
      const $rows = $repeater.children('.aksrt-widget-repeater__rows');
      if ($rows.children().length >= max) return;
      const index = $rows.children().length;
      const token = String($repeater.data('index-token') || '__index__');
      const html = $repeater.children('template').html().replaceAll(token, String(index));
      const $row = $(html).appendTo($rows);
      initForm($row);
      renumberRepeaters.call($rows[0]);
    })
    .on('click', '.aksrt-widget-repeater__remove', function () {
      const $rows = $(this).closest('.aksrt-widget-repeater__rows');
      $(this).closest('.aksrt-widget-repeater__row').remove();
      renumberRepeaters.call($rows[0]);
    })
    .on('click', '.aksrt-widget-upload__choose', function () {
      const $wrap = $(this).closest('.aksrt-widget-upload');
      const frame = wp.media({ title: '选择媒体', multiple: false });
      frame.on('select', () => {
        const attachment = frame.state().get('selection').first().toJSON();
        $wrap.find('input[type="url"]').val(attachment.url).trigger('change');
        let $image = $wrap.find('img');
        if (!$image.length) $image = $('<img alt="">').prependTo($wrap);
        $image.attr('src', attachment.url);
      });
      frame.open();
    })
    .on('click', '.aksrt-widget-upload__remove', function () {
      const $wrap = $(this).closest('.aksrt-widget-upload');
      $wrap.find('input[type="url"]').val('').trigger('change');
      $wrap.find('img').remove();
    });

  $(document).on('widget-added widget-updated', function (_event, widget) {
    $(widget).find('.aksrt-widget-form-lazy').each(function () { loadForm(this); });
  });

  $(function () {
    $('.aksrt-widget-form').each(function () { initForm(this); });
    $('.widget.open .aksrt-widget-form-lazy').each(function () { loadForm(this); });
  });
})(jQuery);